| 摘要 |
A ballast that comprises a DC-DC converter, a DC-AC converter, a lighting voltage generator and a control unit. A difference in voltage between input terminals of the lighting voltage generator is generated by a voltage step-up circuit of the "self-boosting" type from a DC voltage supplied by the DC-DC converter and an auxiliary voltage source V 0 . The ballast makes it possible to obtain a voltage level V 2 that is equal to twice a first voltage level V 1 increased by the auxiliary voltage V 0 .
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